I have a 2002 mustang gt manual that has trouble starting can you please help?
heres a video pay attention of the rpms
View: https://youtu.be/mjdyrtOFhV8
heres a video pay attention of the rpms
That "Service Engine Soon" light means the PCM has detected errors. If you don't have a code reader, most parts stores will read them for free. That may very well point to your problem.
Well I actually tested my car with an obd2 code scanner and a code say "idle air circuit malfunction" I think the number was p0511 what part or what can prevent this starting problemHere's some information on how to trouble shooting IAC/idle.
Troubleshoot IAC idle problems 1996-2004
Troubleshoot IAC idle problems 1996-2004
Back to the basics. Check for blown fuses. Especially fuse F2.2 and F2.8 in the Central Junction Box (CJB 1999-2004 MY). Confirm key on power using a known good ground. 1999-2004 MY fuse panel schedule...www.stangnet.com
Start with a through review of the battery and charging system. Why is this important? Because if the battery voltage is unstable this will cause the PCM to "forget" the adaptive idle trim values.
Howto perform charging system voltage drop test
Howto perform charging system voltage drop test
To anyone else reading any of my posts I usually include the line: Today's cars simply will not run right without a strong battery and charging system! Cut corners here at your own risk I'm a big believer in starting with the basics. As such I...www.stangnet.com
In the how to, pay attention to the part about how the TPS is used to form a "ratch" function. As well as how the TPS is used to compute the TP-MODE
To truly trouble shoot this issue an ODB2 scanner could make short work of this problem. Here's some information on an affordable Windows unit.
ForScan ODB2 scanner w ELM327 USB
ForScan ODB2 scanner w ELM327 USB
While working on your car have you ever wanted: to find an ODB2 operational PID value (say fuel pressure or MAF)? How about graph a PID value over time? Or compare multiple PID's over time? Access a bi-directional PCM control such as test a...www.stangnet.com
Do you want an educated WAG? How about a loose throttle body butterfly. Such that when the motor starts up the motor's vacuum is pulling in the butterfly thus changing it's position. There's a delay as the IAC adjusts the idle.
Bottom line. The throttle position MUST remain stable when the throttle is closed. The voltage of the TPS does not matter. What is important is for the TPS to send the SAME value each time the throttle is closed.
My cars rpms drop when i unplug it what else could it be the car does die after letting off the gas, like getting on the highway after letting off the car diesThe IAC (Idle Air Controller) provides air to the engine at idle (when the throttle body is closed) and definitely makes sense for what you're seeing. Replacing the IAC may solve the problem, but when I've had physical issues with an IAC in the past, I didn't get a code. Ideally, troubleshoot the IAC (use the links wmburns provided above), and find the underlying cause.
The IAC (Idle Air Controller) provides air to the engine at idle (when the throttle body is closed) and definitely makes sense for what you're seeing. Replacing the IAC may solve the problem, but when I've had physical issues with an IAC in the past, I didn't get a code. Ideally, troubleshoot the IAC (use the links wmburns provided above), and find the underlying cause.
if it helps any my car is straight piped and one was the codes said i was too lean but i figured its cause of the straight pipeHere's some information on how to trouble shooting IAC/idle.
Troubleshoot IAC idle problems 1996-2004
Troubleshoot IAC idle problems 1996-2004
Back to the basics. Check for blown fuses. Especially fuse F2.2 and F2.8 in the Central Junction Box (CJB 1999-2004 MY). Confirm key on power using a known good ground. 1999-2004 MY fuse panel schedule...www.stangnet.com
Start with a through review of the battery and charging system. Why is this important? Because if the battery voltage is unstable this will cause the PCM to "forget" the adaptive idle trim values.
Howto perform charging system voltage drop test
Howto perform charging system voltage drop test
To anyone else reading any of my posts I usually include the line: Today's cars simply will not run right without a strong battery and charging system! Cut corners here at your own risk I'm a big believer in starting with the basics. As such I...www.stangnet.com
In the how to, pay attention to the part about how the TPS is used to form a "ratch" function. As well as how the TPS is used to compute the TP-MODE
To truly trouble shoot this issue an ODB2 scanner could make short work of this problem. Here's some information on an affordable Windows unit.
ForScan ODB2 scanner w ELM327 USB
ForScan ODB2 scanner w ELM327 USB
While working on your car have you ever wanted: to find an ODB2 operational PID value (say fuel pressure or MAF)? How about graph a PID value over time? Or compare multiple PID's over time? Access a bi-directional PCM control such as test a...www.stangnet.com
Do you want an educated WAG? How about a loose throttle body butterfly. Such that when the motor starts up the motor's vacuum is pulling in the butterfly thus changing it's position. There's a delay as the IAC adjusts the idle.
Bottom line. The throttle position MUST remain stable when the throttle is closed. The voltage of the TPS does not matter. What is important is for the TPS to send the SAME value each time the throttle is closed.
Straight pipes won't CAUSE a lean DTC. IMO it's more likely there really is a vacuum leak.if it helps any my car is straight piped and one was the codes said i was too lean but i figured its cause of the straight pipe
Here's some more information.Sometimes the car doesn't start at all
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